With today's announcement of the new Sony Ericsson Aspen Windows phone, Microsoft also officially introduced Windows Mobile 6.5.3 Professional. What sounds like a minor update to Windows Mobile 6.5 only is a little bit more, especially because it changes the graphical user interface Microsoft introduced with the originla Pocket PC back in 2000 and which was updated later with the introduction of Windows Mobile 5.0. Furthermore Windows Mobile 6.5.3 also includes some minor and major under the hood updates for browser performance and quality.